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<br />n" "t."'8 <br />:1 ,. -J' <br /> <br />126. Boberg, W. W., 1970, Transportation and precipitation of uranium in the South Platte River, <br />Colorado: University of Colorado, MS thesis. <br /> <br />127. Boberg, W.W., and Runnells, D.o., 1971, Reconnaissance study of uranium irt the South Platte <br />River, Colorado: Econ. Geol., v. 66, no. 3, p. 435-450. <br /> <br />Anomalously high uranium content, possible ore-body in the drainage basin <br /> <br />128. Bogardi, 1., Kelly, W.E. and Fried, J.J., 1986, Risk versus cost in ground water nitrate pollution, <br />in B. J. Graves, K. Butcher and M. E. Renz, chairpersons, Agricultural impacts on ground water; <br />a conference: Dublin, Ohio, Natl. Water Well Assoc., p. 482-507. <br /> <br />129. Bohomont, B.L., 1991, Colorado pesticide use survey; estimated use -1989: Fort Collirts, Colo., <br />Colorado State University, 43 p. <br /> <br />130. Bolivar, S.L., Broxton, D.E., and Olsen, C.E., 1978, Uranium hydrogeochemical and stream <br />sediment reconnaissance of the Denver and Greeley NTMS Quadrangles, Colorado: N. Mex., <br />Los Alamos Scientific Lab., Department of Energy, Internal Report LA-7177-MS, GJBX-60-78, <br />138 p. <br /> <br />Although this report covers two National Topographic Map Series 2 exp 0 <br />quadrangles, the data for each quadrangle are presented separately. Evaluation of the <br />data by quadrangle resulted in the delineation of areas in which water and/or <br />sediment uranium concentrations are notably higher than surrounding background <br />concentrations. The major clusters of anomalous water samples were found in areas of <br />the Denver Basin underlain by the Pierre, Laramie, Fox Hills, Denver, and Arapahoe <br />Formations. Most of the anomalous sediment samples were collected in areas of the <br />Front Range underlain by Precambrian crystalline rocks, particularly granites of the <br />Silver Plume-Sherman group. Many of the anomalous sediment samples are from sites <br />located near fault zones. The data in this report are also presented by geologic/ <br />physiographic province because background uranium concentrations in Front Range <br />samples differ significantly from those in the Denver Basin. Denver Basin waters have <br />higher mean uranium concentrations (mean 14.4 ppB) than Front Range waters (mean <br />3.3 ppB). Conversely, Front Range sediments are more uraniferous (mean 14.7 ppM) <br />than those in the Denver Basin (mean 6.1 ppM). These differences in background <br />uranium concentrations between Front Range and Denver Basin samples can be <br />attributed to differences in regional geology, physiography, and (in the case of water) <br />the ratio of surface water to ground water sites sampled. There is a significant <br />northward increase in uranium concentrations in water samples from the Denver <br />Basin. The higher uranium concentrations in water samples from the northern part of <br />the basin are probably due to leaching of uraniferous strata in the Pierre and Laramie <br />Formations which crop out in that area. <br /> <br />131. Booker, J., Young, R.A., Zhang, C.M. and Morel-Seytoux, H.J., 1990, HELM: An integrated <br />model applied to the South Platte Stream Aquifer System, in Groundwater Engineerirtg and <br />Management Conference: Denver, Colo. <br /> <br />132. Boos, C.M., 1924, The geology of the Big Thompson River Valley from the Continental Divide <br />to the foothills area: The University of Chicago Abstract of Thesis Sci. Serv., v. 11, p. 217-222. <br /> <br />BIBLIOGRAPHY 27 <br /> <br />